292 Proceedings of Indiana Academy of Science 
FIGURE I. 
Nitrifying Power of Crops. 
DISCUSSION OF TABLE 8. 
Effect of Different Crops on Nitrifying Power of the Soil Measured 
by the Averages of all Plots Growing the Same Crop. 
In Table 8 the differences between the incubated and fresh samples 
for all the corn, all the wheat, all the oats and all the soybean plots, 
are averaged and tabulated. 
The curves for these averages are shown in Figure I. 
